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Properties of the Number 1890

One Thousand Eight Hundred Ninety

Basics

Value: 1889 → 1890 → 1891

Parity: even

Prime: No

Previous Prime: 1889

Next Prime: 1901

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 3 × 5 × 7

Divisors: 1, 2, 3, 5, 6, 7, 9, 10, 14, 15

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 11101100010

Octal: 3542

Duodecimal: 1116

Hexadecimal: 762

Square: 3572100

Square Root: 43.474130238568314

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Sum of all parts of all partitions of n. A66186
Triangle read by rows, Bell transform of Bell numbers. A264428
Triangular matchstick numbers: a(n) = 3·n*(n+1)/2. A45943
Triangle T(n,k) of rencontres numbers (number of permutations of n elements with k fixed points). A8290
a(n) = n*(n+3). A28552
Let Sk denote the first 2k terms of this sequence and let bk be the smallest positive integer that is not in Sk; then the numbers bk*Sk are the next 2k terms. A52330
a(n) = n*(2·n + 3). A14106
a(1)=1, a(2)=2; thereafter, a(n) is the smallest number m not yet in the sequence such that every prime that divides a(n-1) also divides m. A60735
Triangle read by rows: T(n,k) = number of partial derangements, that is, the number of permutations of n distinct, ordered items in which exactly k of the items are in their natural ordered positions, for n >= 0, k = n, n-1, ..., 1, 0. A98825
Numbers k such that σ(k) > 3·k. A68403